/Engine/Source/Editor/UMGEditor/Public/WidgetBlueprintExtension.h
It is illegal to perform this operation once compilation has commenced, use GetExtension instead.
static [UWidgetBlueprintExtension](API\Editor\UMGEditor\UWidgetBlueprintExtension) * RequestExtension ( [UWidgetBlueprint](API\Editor\UMGEditor\UWidgetBlueprint) * InWidgetBlueprint, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UWidgetBlueprintExtension](API\Editor\UMGEditor\UWidgetBlueprintExtension) > InExtensionType )